Bath pond

hi everyone, i have just aquired an old bath for my lottie and i thought it would make a nice pond tucked away in a corner somewhere,full of tadpoles to help the fight against the beasties and the like.what i want to know is what do i have to put in it besides the water any particular things like plants or gravel in the bottom? or just leave it to nature? has anyone got one? any advice would be appreciated.

Will there be any problem with stagnant water. I have a bath to collect the rain water and its gone a very funny green colour.

You could try some oxygenator plant to help combat the water going green.  I strongly agree with putting plants etc in that enable wildlife to get out of the pond (Ideally with a pond I think you need to have one end shallower than the other to enable this), not only for the intended wildlife but also for the accidental arrivals eg hedgehog or birds (you don't want them to drown if they can't get out).  Please also consider netting your bath/pond when the baby birds are around in case any fall in.  As for plants, it could be a good idea to avoid yellow iris - its really pretty BUT we have it in our pond and it gets really dominant and trying to thin it out is a challenge!!